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Looking for a quieter valve/cannon design

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Looking for a quieter valve/cannon design

Unread postAuthor: urbanfarm » Sat Dec 06, 2008 6:46 am

I am planning my next projects namely 1/4" and 3/4" barrel devices approx 3' and after experiencing the noise of a 2" barrel piston cannon prototype, I would like something much quieter.

I am thinking if I could mount a spring on the back of the piston that may help, am also trying to muffle the noise with an inner tube over the outlet.

Will a QEV be any quieter?

Perhaps another method?

Burst disc seems a good option although it seems quite fiddly....

Please help this noob
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 06, 2008 7:14 am

The main source of noise in a pneumatic is the muzzle blast, so if you want to deaden noise you're either going to have to make a small chamber relative to your barrel, or invest some time and energy into making a suppressor ;)
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Unread postAuthor: spudkilla » Sat Dec 06, 2008 8:54 am

But Jack, Those are illegal. :twisted:
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Why do I try to make a relevant post?
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 06, 2008 9:03 am

spudkilla wrote:But Jack, Those are illegal. :twisted:


If you make it removable and threaded to fit a firearm, yes. If it's just an integral barrel sleeve however I think you're quite safe.
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Unread postAuthor: Sticky_Tape » Sat Dec 06, 2008 9:04 am

Isn't everything? I would say keep the piston valve. QEVs that size are exspencive and a burstdisk will be louder.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: Brian the brain » Sat Dec 06, 2008 11:58 am

okay, I've been giving the same advice all day.
Mod a QEV by drilling a equilising hole and install a soft return spring.

This will enable you to get multiple shots by cutting off flow to the barrel when the pilot ( blowgun?) is closed.

This also means you keep maximum power, but when the ammo leaves the barrel, the QEV gets "sucked" closed, so you dont get unnessesary "afterblast".

Furthermore you could use a long barrel with a silencer at the end and run a line from the blowgun into the silencer as well.
Trust me. your neighbours will hear NOTHING.Only noticable sound is the ammo hitting the target.
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Unread postAuthor: grumpy » Sat Dec 06, 2008 12:49 pm

jackssmirkingrevenge wrote:
spudkilla wrote:But Jack, Those are illegal. :twisted:


If you make it removable and threaded to fit a firearm, yes. If it's just an integral barrel sleeve however I think you're quite safe.


they are not illegal but you must have a special permit for it .
In the U.S. , if it can be sawed off the barrel and in any way attached to a firearm you must get a special permit for it.
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Unread postAuthor: ALIHISGREAT » Sat Dec 06, 2008 1:03 pm

my copper coax's piston made one hell of a clang, due to the fact i didn't install a bumper LOL so i glued 2 layers off bike tye inner tube onto the piston back to quieten it down.

and i doubt you'll get arrested it you make a permanently attached silencer...?

anyway, seeing as you can use a drinks bottle as a suppressor... i doubt you can get a $200 fine for having a bottle of lemonade in your fridge?
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